Can't help you, but have the same question! We've narrowed down to the Britax Vigour 4+, the Maxi Cosi Loola Up and the ever-so-expensive Bugaboo. The Vigour 4+ is our favourite at the mo (lighter than the Loola, and better height handles for me) but the width of the large back wheels worries us a bit as I'll be using the bus and tube a lot when my husband is out at work. Shame there's no 'guaranteed to fit on a London bus' certificate! I'll let you know if I find out - you do the same please . Thinking of writing to London transport and asking how wide their bus doors are, and that space they have for pushchairs near the front of the bus...